Cushion attachment for presses



Jan. 14, 1930. I F, J, ROBE 1,743,484 J CUSHION ATTACHMENT FOR PRE SSES Filed 1925 2 Sheets-Sheet 1 Jan. 14, 1930. F. J.- RODE 1,743,484

cuS-nrou ATTACHMEN'I FOR PRESSES Filed Nov. 5, 1925 2 Shets-Sh'et 2 jwenlfop JHZMOMJEOaQ,

Patented 14',-.-1e30 1 rnnnnrcn J. nonnor cnrcaeo,

rumors, Assienon 'ro mums moor. a unwrac'ruameco, or cmcaeo, rumors, n conroaarronion'znnmols cusmon arracnnnn'r r o'n' rirnssns Application and November}, 1925, we m; 68,810. Y

This invention relates to improvements in cushion attachments, particularly adapted, though not necessarily limited in its use, in connection with machines 1 for shaping the heads of engine poppet valves. a

'In such operations dlfllQllltlGS are often experienced by reason of the diflerence in thickness and quantity of the material'in the valve head when these, parts are shaped in a mechanically operated power press.

" Such power presses may be set so that the reciprocating ram of the press will move to a predetermined but fixed point with each stroke of the ress, but when the valve head is thicker and contains more material than the thickness to which the press has been set, the valve will not be properly shaped and the strain exerted upon the' crank shaft, dies and other parts of thepress or machine will bend the crank shaft and injure the dies and other parts of the I ress.

'In ,such shaping an when-it is necessary to forge thevalvehead to eliminate-machine work on the piece as is i done in modern practice, it is necessar to squeeze the material with a predetermined pressure. If, as is often the case, the forged material to be squeezed varies in thickness,

such for instance as the valve containing in v its-head a quantity of material more than the thickness -to which the press has been set, it is necessary to selectvalves having heads of the predetermined thickness to which the press has been set and then reset or adjust nes'ses of the wor To provide a ress which will. automatically compensate the varying thicknesses of the work to be done without the necessity of resetting or adjusting the machine or press and to provide means whereby the valve head may be completely shaped and finished in the machine in a single operation, with the eXception of that portion' which constitutes the valve seat, it being necessary to face the latter in a subsequent operatlon so as to produce a perfect fit, is one of the objects of the present invention. I is A further object is to provide an improved cushion of this character embodying means' 'view'of a cushion attachmentof forging operations bl Stet the press to compensate thevarying thick-.

whereby the resistance pressure of the cushion v i i may be varied at w1ll.. Tothe attainment f these ends and the accomplishment of other new and useful objects as will ap ear, the inventionconsists in the features 0 novelty in substantially the .construction,combination, and arrangement of the several parts here nafter more fully described andclaimedand shown in the accompanying drawings illustrating ,this invention, and in which A Figure l is a vertlcal longitudinal'sectional acterf constructed in accordance "with the principles of. this invention.

- Figure 2 is a view partly 1n side'elevation,

partly broken away and with parts omitted, of Figure 1. p f

Figure 3 is a detail'edelevation of a valve shaped in accordance withthp principles of this invention. j Y Referrin'gmore particularly to-the drawing the numeral 10 design'ates' generally. the b0 ster or bed plate of a press, beneath which I a tubular member 11 is supported in an suitable manner. Within the tubular mem er 11 is a supporting member 12 having a head 13 'd'carried by the head 13 is a die 14 removsecured thereto in any suitable manner, a

as by means of fastening bolts 15.

- The die 14 is shaped to'conform to the con: tour of the valve and the member 12 may be arrested in its upward movement b means this charof an annular member 16 supporte by the bed plate of the machine and a portion of whichmember 16 overhangs the end of the member 13, as at 17. l

A reciprocating member18 has connected with it a die 19 which is op osed to and co- 0 crates with the die 14, an betweenv wh ch d1es the valveghea'd 20 is shaped, the. stem 21 of the valve projecting through the die 14 and preferably into the member '13.

The-reciprocating member 18 s operated in any suitablemanner well known in th s art, (not shown). a

The member by means of levers 22 pivotally mounted intermediate their ends as at 23, preferably preferably by. means of'a crank shaft p 13 is iyieldingly supported ,1

in abifurcated portion 24 at the lower end of the member 11. The extremities 25 of the levers preferably project into the tubular member 11 and operatefupon the end of the member 13, a wear plate'26 being preferably dispose'd intermediate the end of the member 13 and the extremities 25 of the lever 22.

Supported by a fixed portion of the ma chine, preferably from the bed plate, are brackets 27 to which are secured, preferably so as to depend therebelow, resistance pressure cushions preferably in the form of cylinders 28. 4

These cylinders may be of any desired size and any number of cylinders may be provided which are superposed and the number and size of the cylinders is determined by the amount of resistance pressure which it is desired to obtain and also according to the size of the space in which the cushions are to be arranged.

In the present form of the invention three of such cylinders are shown on each side of the press and for each of the levers 22.

A piston 29 is provided in each of the cylinders and these pistons are connected by means 1 rod passes.

The extremity 34 of the piston rod projects beyond the head of the lowermost cylinder and is connected, preferably by means of a pin and slot connection 35-36 with the other end of the respective levers 22.

Fluid is supplied to the cylinders from,

any suitable source (not shown)v preferably through the medium of a supply pipe 37 having branches 38 which lead into the respecti've cushions.

' A pressure regulating valve designated 'generally by the reference numeral 39, and of any desired and suitable construction, may be provided in the pipe 37 whereby the defor knocking out. the valve a gree of fluid pressure in the c lindersmay be controlled and varied at will 4 A knock out rod or bar 40 may be rovided ter t e same I has been shaped.

member 13 and'ma be. supported and op- This knock out rod operates through the erated in any desire or suita 1e manner, but 1s preferably supported by means of a cross baror rod 41 which may be supported by means of bars or rods 42 that are connected with a movable part of the press, preferably valve which it is necessa to the ram of the press. The knock out rod may .be provided with a head 43 which is adapted to engage the end of the valve stem 21 and the rod 40 is of such a length that as the ram or removable part of the press to which it' is connected descends it will move away from the endof the valve stem 21. At

a predetermined point in the cycle of operation of the press or when the movable part of the press to which the knockout rod is connected reaches a predetermined point, that is when it moved away from the work a sufficient distance to permit the work to be ejected, the end of the'knockout rod will engage the end of the valve stem and will raise the same sufficiently to permit the opgrator to remove the finished work from the In operation and assuming the ram and die 19 to be elevated, the head of the valve to be shaped is heated to the desired temperature and the valve is then placed into the die 14 previous to which, however, the amount 0 fluid pressure which it is desired to maintain in the cushions must be established by permitting the fluid to enter the cylinders.

The-ram then descends so that the die 19 will operate upon the work with a set throw. The resistance pressure created in the cushions will be manifested upon the member 13 and die 14 throughthe medium of the levers 22 and this pressure is sufficient to maintain the valve 20 in a proper or predetermined position with respect to the length of stroke of the die 19, under normal conditions or when the press has been set to operate upon the heads of the valves of predetermined thicknesses.

Should the valve head contain more material or is thicker than the thickness to which the press is set, the setting of the press being accomplishedintheordinary and well known manner, the resistance pressure of the cushions will be overcome by the pressure of the ram and the die 19 upon the work, causing the die 14 and member 13 to yield under such excess pressure or abnormal conditions.

The resistance-pressure will at all times, however, be sufficient even though the valve 20 should yield under such abnormal conditions, as to cause the valve head to be propith this invention it is possible to shape all of the faces of the head of the valve 20 in one operation thereby obviating the necessit of further shaping operations upon the va ve when it is removed from the press, with the exception of the face or surface 44 (see Figure 3) which constitutes the valve seat, and this surface is the only portion of the to erform any further-operation upon a ter t e valvevhas been shaped in the manner just described.

The extremities 25 of the levers 22 are stationarypart of the machine, means forarranged to one side of the center of the iv ots 23 of the levers so that the rocking '0 the levers 22 by the excess pressure upon the die to be understood that various changes may j be made in the details of construction and in the combination and arrangement of the several parts, within the scope of the claims, without departing froin the spirit ofthis invention.

What is claimed as new is 1. In a forging machine a movable forg ing member, a fluid pressure cushion, and means interposed between said member and the said cushion whereby the cushion will exert a resistance pressure upon the said member, said cushion embodying a plurality of superposed cylinders and pistons individual to and movable in the respective cylinders, the pistons being connected together in fixed relation to each other and for movement in unison. v

r 2. In a forging machine a movable forging member, a cushion, a lever interposed between the cushion and said member, the said member and the said cushion being one connected with said lever and the other having contact with the lever whereby the cushion will exert a predetermined resistance pressure upon the said member, said cushion embodying a cylinder and piston one of which is operatively connected with the lever, the other being connected with a stationary portion of the machine, means forsupplying fluid pressure to the cylinder, and means whereby the degree of fluid pressure in the cylinder may be varied at will. I

3. In a forging machine a movable forging member, .a pivotally mounted element with which said member has contact, a predetermined resistance pressure cushion including a cylinder and piston,-one of which is con-, nected to the said element and the other to a stationary part of the machine, and means for supplying a pressure fluid to the said cylinder.

4. In a forging machine a movable forging member, a pivotally mounted element with which said member has contact, a predetermined resistance pressure cushion including a cylinder and piston, one of which is connected to the said element and the other to a supplying a pressure fluid to the said'acylpivotally mounted intermediate its ends below the first said support, one end of the lever being operativel connected with the cushion, the other en of the lever being deflected and projecting into the first said support contacting'with but disconnected from the said supplemental support.

6. In a forging machine, a stationary support, a supplemental support telescoping thereinto, a die member carried with the supplemental support, a cushion, a lever pivotally mounted intermediate'its ends below the first recited support, said cushion embodying a clylinder and piston member, said cylinder an piston being connected'one with a fixed support and the other with one end of the lever, the other end of the lever being deflected and projecting into the first said support, contacting with but disconnected from said supplemental support, and means for supplying fluid to the cushion.

In a forging machine, a stationary support, a supplemental support telescoping thereinto, a die member connected with the supplemental support, a cushion, a lever pivotally mounted intermediate its ends below the first said support, one end of the lever being operatively connected with the cushion, the other end of the lever being positioned to contact with but being disconnected from the said supplemental support, said cushion embodying a plurality of superposed cylinders, and pistons individual to the respective cylinders, said pistons being connected together in fixed relation. 1

In testimony whereof I have signed my nameto this specification, on this 2nd day of November, A. D. 1925. i

FREDRICH J. RODE.

inder, and means whereby the fluid pressure may be varied at will.

5. In a forging machine, a stationary support, a supplemental support telescoping thereinto, a die member carried with the supplemental support, a cushion, and a lever 

